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Aegisub language packages

Originally created as tool to make typesetting, particularly in anime
fansubs, a less painful experience, Aegisub has grown into a fully fledged,
highly customizable subtitle editor.

It features a lot of convenient tools to help you with timing, typesetting,
editing and translating subtitles, as well as a powerful scripting
environment called Automation (originally mostly intended for creating
karaoke effects, Automation can now be used much else, including creating
macros and various other convenient tools).